High-speed tool-steel



I the like.

152,725, filed UNITED STATES PATENT OFFICE.

WALTER LOTHAR EDUARD EILENDER, OF REMSCHEID, GERMANY, ASSIGNOR; BY MESNEASSIGNMENTS, TO THE CHEMICAL FOUNDATION, INC., A CORPORATION OFDELAWARE.

HIGH-SPEED No Drawing. Application filed March 6,

To all whom it may concern.-

Be it known that I, WALTER LOTHAR EDU- ARD EILENDER, a subject of theGerman Emperor, and residing at Remscheid, Germany, have inventedcertain new and useful Improvements in High-Speed Tool-Steels, of whichthe following is a specification.

High speed steels are as a rule produced by alloying a carbon-steel ofthe desired hardness, which contains between 0.1 and 0.3 p. c. manganeseand 0.1-0.3 p. c. silicon with 3 to 7 p. c. chromium and 18-25 p. c.tungsten. Such steels are called chromiumtungsten-steels.

It is known to alloy such steels with small quantities of vanadium,molybdenum and They then are called, for example,chromium-tungsten-molybdenum-steels.

If, as it is known, such steels arefurther alloyed with largerquantities of cobalt, they are called chromium-tun sten-cobalt-steels.

In my ap lications os. 152,724 and arch 6, 1917, are described, first ahigh speed steel in which the tungsten is replaced by molybdenumrepresentin a chromium-molybdenum steel, and, secon a high speed steelwhich may be called a chromium -'molybdenum vanadium or achromium-molybdenum-cobalt-steel.

Later experiments have proved, that it is possible to omit the additionof molybdenum, if the content of manganese is raised to about 2 p. c.,that of chromium is increased some de ees and 1.0 to 5.0 .p. c. ofcobalt are added? I then produce a chromium-cobalt-steel.

As in steels known till now, also in the new chromium-cobalt-steel thequantity of the different components may be varied Specification ofLetters Patent.

1.0-2.0 p. 0. Mn p. c. Cr, 1.0-5.0 p. 0. Co.

TOOL-STEEL.

Patented Apr. 20, 1920. 1917. Serial No. 152,726.

within certain limits without causing the steel to become useless.limits less of one element sated by more of another.

The new chromium-cobalt-steel may be improved in its working capacity asa high speed steel, by an addition of 0.l52.0 p. c. vanadium. By doingso, I produce a chromium-cobalt-vanadium-steel.

A steel of the followin composition, 0.6 1.2 p. c. C, 1.0-2.0 p. c. n,0.1-0.3 0. Si, 3.0l0.0 p. 0. Cr, 1.0-5.0 p. c. 00, found to be bestsuited as a high speed steel.

The steel may be produced by melting, in crucibles, bar steel containingthe required amount of carbon, manganese, silicon, and also vanadium, ifdesired, and adding thereto the re uisite amount of the metals chromiuman cobalt, viz., 3 to 10 per cent. chromlum, and 1 to 5 per cent.cobalt, and after proper fusion the fused metal is poured may becompenfrom the crucible into suitable ingot molds.

at I claim and desire to secure by Letters Patent as my invention is 1.The herein described high speed steel, containing besides iron also0.6-1.2 p. c. O, 0.1-0.3 p. 0. Si, 3.0400

2. The herein described high speed steel contaming besides iron also0.64.2 p. c. G, 1.0-2.0 p. c. Mn, 0.1-0.3 0. Si, 3.010.0 p. 0. Cr,1.0-5.0 p. 0. Co an 0.152.0 p. 0 Va.

In testimony whereof I hereunto aifix my slgnature in the presence oftwo witnesses.

WALTER LOTHAR EDUARD EILENDER.

Witnesses: HELEN Norma, Fmons Nurse.-

Within certain i

